Urban GPR for gallery positionning

The unknown position of an old mining gallery impacted the design of a new building. In order to locate in three dimensions this infilled gallery dug in the first meters below ground level, GPR and high resolution S-Waves seismic were used.

GPR allowed for a very accurate positionning of the gallery along with other buried services. S-Waves have provided additionnal information in areas were the gallery reached more than 5 meters underground.

GPR Two-way time section and interpreted migrated depth section. Anthropic features, including the buried gallery are easily identifies along with the continuous top of Molasse.

Location Switzerland
Instrument IDS Opera Dua
Positioning DGPS
Surface 20x20m
Personnel 2 people
Duration 0.5day